Taylor C152, Service Manual, Page: 26 / 88

2-8
CONTROLS
Model C152 & C161
Controls
2
4. The beater motor (BTR) relay closes and opens
again. The Standby light extinguishes.
5. The Com (compressor) relay closes and opens
again. The Wash light extinguishes.
6. All lights turn off and a tone sounds for 3 seconds.
This designates the end of Part I of the self-test.
If all or most of the power board relays fail to close, the
logic board is damaged. If only one relay fails to close,
the power board is damaged. This test can be used to
determine if a problem exists with the logic board, the
power board, or elsewhere in the freezer. In other words,
if during the test, the beater relay closes on the power
board, but the beater motor contactor does not operate,
the problem occurs after the command reaches the
power board.
Self-Test—Part II
When Part I of the self-test is complete, the control will
advance to the starting point of Part II. The technician
needs to complete this portion of the test. The beginning
of Part II verifies the function of the control
potentiometers (adjustment screw).
During this test, the Mix, Standby, Wash, Auto, and Pump
lights function in direct relationship with the MIN and
MAX adjustments of the potentiometer. In other words,
when the adjustment screw is turned all the way to MIN,
the Mix light will be illuminated. When the adjustment is
turned all the way to MAX, the light will travel down and
illuminate the Pump light. If the screw adjustment is
made between the MAX and the MIN adjustments, one of
the other lights will illuminate depending on the
adjustment.
These lights create a bar graph that is directly related to
the product temperature. Mix is warm, and Pump is cold.
1. The Set Point light is illuminated, indicating that the
control is reading the soft serve viscosity

potentiometer.
2. Rotate the adjustment screw back and forth from MIN
to MAX. The bar graph should travel accordingly,
indicating that the potentiometer is functional.
If the bar graph lights do not react, the logic board is
damaged.
IMPORTANT! If the machine’s controls have
been set previously, return the adjustment to its original
position. For example, if the WASH light was illuminated
before an adjustment screw was rotated, before going to
the next step, rotate the adjustment screw until the
WASH light is illuminated again.
3. Press the Mix button once.
4. The Mix-Low light is illuminated, indicating that the
control is reading the Mix potentiometer.
5. Repeat step 2.
6. Press the Mix button once.
7. The Mix-Out light is on, indicating the control is
reading the Standby potentiometer.
8. Repeat step 2.
9. Press the Mix button once.
10. The Mix-Low light is illuminated, indicating that the
control is reading the Mix 1 terminal.
11. The capability of this terminal to read the thermistor
probe can be checked by the following method.
a. Remove the thermistor probe wire from the Mix 1
terminal.
b. Connect the Mix 1 terminal directly to ground
(simulating a warm probe). The Mix light will
illuminate.
c. Remove the terminal connection from ground
(simulating a cold probe). The Pump light will
illuminate.
If the lights do not react, the panel is inoperative.
12. Press the Mix button once.
13. The Mix-Out light is illuminated, indicating that the
control is now reading the Barrel (freezing cylinder)
probe terminal.
14. Check the Barrel (freezing cylinder) probe by
removing the wire from the panel.
15. Press the Mix button again, and the self-test program
is terminated.
!